The F-line was a line of genetic slaves bred by Manpower Incorporated of Mesa.
F-lines were bred to do heavy manual labor, so they were designed to be physically strong and muscular.
Donald X, or F-67d-8455-2/5, was an escaped F-line who joined the Audubon Ballroom. (CS1)
Hugh Arai, or F-23xb-74421-4/5, was an F-line who joined the Beowulfan Biological Survey Corps after his rescue. (CS2)
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